﻿using Recipes.Model;
using Recipes.ViewModel;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.IO;
using System.Linq;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// The Basic Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234237

namespace Recipes.Pages
{
    /// <summary>
    /// A basic page that provides characteristics common to most applications.
    /// </summary>
    public sealed partial class ListPage : Recipes.Common.LayoutAwarePage, INotifyPropertyChanged
    {
        private string _header;
        /// <summary>
        /// Imposta o ottiene l'header della pagina
        /// </summary>
        public string Header 
        {
            get { return _header; }
            set
            {
                _header = value;
                notifyPropertyChanged("Header");
            }
        }

        public ObservableCollection<ShortRecipe> _recipes;
        /// <summary>
        /// Imposta o ottiene l'elenco delle ricette da mostrare nella pagina
        /// </summary>
        public ObservableCollection<ShortRecipe> Recipes 
        {
            get { return _recipes; }
            set
            {
                _recipes = value;
                notifyPropertyChanged("Recipes");
            }
        }  

        /// <summary>
        /// Costruttore della pagina
        /// </summary>
        public ListPage()
        {
            this.InitializeComponent();
            DataContext = this;
        }
        
        /// <summary>
        /// Metodo invocato quando si naviga verso questa pagina.
        /// Viene utilizzato per inizializzare alcune variabili
        /// </summary>
        /// <param name="e"></param>
        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);
            //Ottengo l'header dai parametri di navigazione
            Header = e.Parameter as string;
            //Ottengo la chiave per effettuare la ricerca
            string key = Header.Contains(" ") ? Header.Replace(" ", "_") : Header;
            //Ricerco tra le ricette scaricate tutte quelle della categoria che corrisponde alla chiave
            List<Recipe> rec = App.downloadedRecipes.Where(x => x.FeedCategory.ToString() == key).ToList();

            //Preparo una lista di ricette da impostare
            List<ShortRecipe> toSet = new List<ShortRecipe>();
            foreach (var r in rec)
            {
                //Per ogni ricetta che la ricerca ha ritrovato, 
                //creo una ricetta adatta ad essere mostrata nell'elenco
                toSet.Add(new ShortRecipe(r));
            }
            //Imposto le ricette da mostrare
            Recipes = new ObservableCollection<ShortRecipe>(toSet);
            
        }

        /// <summary>        
        /// Metodo invocato quando l'utente tocca un elemento
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Element_Tapped(object sender, TappedRoutedEventArgs e)
        {
            Grid s = sender as Grid;
            Guid guid = (Guid)s.Tag;
            this.Frame.Navigate(typeof(Pages.RecipePage), guid);
        }

        /// <summary>
        /// Populates the page with content passed during navigation.  Any saved state is also
        /// provided when recreating a page from a prior session.
        /// </summary>
        /// <param name="navigationParameter">The parameter value passed to
        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
        /// </param>
        /// <param name="pageState">A dictionary of state preserved by this page during an earlier
        /// session.  This will be null the first time a page is visited.</param>
        protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
        {
        }

        /// <summary>
        /// Preserves state associated with this page in case the application is suspended or the
        /// page is discarded from the navigation cache.  Values must conform to the serialization
        /// requirements of <see cref="SuspensionManager.SessionState"/>.
        /// </summary>
        /// <param name="pageState">An empty dictionary to be populated with serializable state.</param>
        protected override void SaveState(Dictionary<String, Object> pageState)
        {
        }

        /// <summary>
        /// Evento dell'interfaccia INotifyPropertyChanged
        /// Necessario per collegare la UI con il codice.
        /// </summary>
        public event PropertyChangedEventHandler PropertyChanged;
        private void notifyPropertyChanged(string p)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(p));
        }
    }
}
